不使用FXML的舞台JavaFx USE_COMPUTED_SIZE

Question

在JavaFX场景生成器中，我可以为Control或Container的最小、最大和首选宽度和高度选择一个值。有一些预定义的值，如USE_COMPUTED_SIZE。

我得出的结论是，出于几个原因，我不喜欢在当前的项目中使用FXML，现在我想知道如何在不使用FXML时设置这些值。

我该怎么做？

我尝试了以下代码：

initializeControls();
addControls();


setMinHeight(Control.USE_COMPUTED_SIZE);
setMinWidth(Control.USE_COMPUTED_SIZE);

addActionListeners();
addFocusChangeListeners();

然而，当试图创建阶段时，这会导致异常：

Exception in thread "JavaFX Application Thread" java.lang.IllegalArgumentException: The width and height must be >= 0. Got: width=-1; height=-1
at com.sun.glass.ui.Window.setMinimumSize(Window.java:984)
at com.sun.javafx.tk.quantum.WindowStage.setMinimumSize(WindowStage.java:291)
at javafx.stage.Stage.impl_visibleChanging(Stage.java:1154)
at javafx.stage.Window$9.invalidated(Window.java:743)
at javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:109)
at javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:143)
at javafx.stage.Window.setShowing(Window.java:841)
at javafx.stage.Window.show(Window.java:856)
at javafx.stage.Stage.show(Stage.java:255)
at dictionary.MainApp.trainVocablesButtonActionPerformed(MainApp.java:281)
at dictionary.MainApp.lambda$addActionListeners$2(MainApp.java:240)
at dictionary.MainApp$$Lambda$281/81350454.handle(Unknown Source)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Node.fireEvent(Node.java:8216)
at javafx.scene.control.Button.fire(Button.java:185)
at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89)
at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3724)
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3452)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1728)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2461)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:348)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:273)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:382)
at com.sun.glass.ui.View.handleMouseEvent(View.java:553)
at com.sun.glass.ui.View.notifyMouse(View.java:925)
at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
at com.sun.glass.ui.gtk.GtkApplication.lambda$null$45(GtkApplication.java:126)
at com.sun.glass.ui.gtk.GtkApplication$$Lambda$42/379110473.run(Unknown Source)
at java.lang.Thread.run(Thread.java:745)

我想，我从错误的类或什么地方获取了USE_COMPUTED_SIZE值，但是从哪里得到正确的值呢？还是整个方法都错了？

我的最终目标是让舞台占据尽可能多的空间来展示所有的控件和容器，但不是更多。

EDIT#1:更正:它应该占用最小宽度和高度所需的空间，这样窗口仍然是可调整大小的，但不能变得太小而不能再显示控件。

EDIT#2:试图在一个较小的示例应用程序上设置最小宽度+高度的结果：

​

代码：

package javafxapplication3;

import javafx.application.Application;
import javafx.geometry.HPos;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Control;
import javafx.scene.control.TextField;
import javafx.scene.layout.GridPane;
import javafx.scene.paint.Color;
import javafx.scene.paint.Paint;
import javafx.scene.paint.RadialGradientBuilder;
import javafx.scene.paint.Stop;
import javafx.stage.Stage;

public class GridPaneExample extends Application {
private final Paint background = RadialGradientBuilder.create()
            .stops(new Stop(0d, Color.TURQUOISE), new Stop(1, Color.web("3A5998")))
            .centerX(0.5d).centerY(0.5d).build();
    @Override
    public void start(Stage primaryStage) {
        GridPane root = new GridPane();
        root.setPadding(new Insets(5));
        root.setHgap(2);
        root.setVgap(2);
        root.setAlignment(Pos.CENTER);
        final TextField tex = new TextField();
        tex.setPrefWidth(250);
        tex.setPrefHeight(50);
        tex.setPromptText("Press the buttons to Display text here");
        tex.setFocusTraversable(false);
        GridPane.setColumnSpan(tex, 7);
        GridPane.setRowSpan(tex, 2);
        root.add(tex, 0, 0);
        GridPane.setHalignment(tex, HPos.CENTER);
        final Button[][] btn = new Button[5][5];
        char ch = 'A';
        for ( int i = 0; i < btn.length; i++) {
            for ( int j = 0; j < btn.length; j++) {

                btn[i][j] = new Button("" + ch);
                btn[i][j].setPrefSize(50, 50);
                root.add(btn[i][j], j, i+2);
                ch++;
                btn[i][j].setOnMouseClicked((mouseEvent) -> {
                    Button b = (Button) mouseEvent.getSource();
                    tex.appendText(b.getText());
                });
            }
        }

        Scene scene = new Scene(root,background);

        primaryStage.setTitle("Grid Pane Example");


        primaryStage.setScene(scene);

        primaryStage.setWidth(Control.USE_COMPUTED_SIZE);
        primaryStage.setHeight(Control.USE_COMPUTED_SIZE);

        primaryStage.show();
    }
    public static void main(String[] args) {
        launch(args);
    }
}

Answer 1

其中一条评论帮助我找到了一个解决方案，尽管它可能不是最好的解决方案:在将所有控件添加到场景之后，我只需执行以下操作：

setMinWidth(getWidth());
setMinHeight(getHeight());

这是因为JavaFX最初将舞台设置为场景中的控件所需的大小。

Answer 2

可能聚会迟到了，但我发现如下：

对于Textfield，有一个静态字段TextField.USE_COMPUTED_SIZE，它的值为-1

我想你也可以把-1传递到舞台上。